Which of the following relations is not correct?

Select the incorrect alternative (s).

When a ferromagnetic material goes through a complete cycle of magnetisation, the magnetic susceptibility 

(a) Soft iron is a conductor of electricity.

(b) It is a magnetic material.

(c) It is an alloy of iron.

(d) It is used for making permanent magnets. State whether

Consider different orientations of a bar magnet lying in a uniform magnetic field as shown below. The potential energy is maximum in orientation

Relative permittivity and permeability of a material are ${\epsilon }_{\text{r}}$ and ${\mu }_{\text{r}}$, respectively. Which of the following values of these quantities are allowed for a diamagnetic material?